I'll move this to the VV3 forum, where all of the VV3 players will see it. I've been down to 1 villager in VV3 several times (I tend to get busy with work and forget about my poor villagers), and an event saves my tribe.

The tribe I'm playing now was down to 1 villager for a long time, and a series of fortunate events kept it going (there are now 53 kids in the tribe). I think VV3 is more forgiving than the previous games in that regard.